The following Siouan Languages tree is based on the information in the Ethnologue.

Siouan Languages

Catawba Stock

Catawba (USA)

Siouan Proper Stock

Central Family

Mandan Branch

Mandan (USA)

Mississippi Valley Branch

Chiwere Group

Iowa-Otoe (USA)

Dakota Group

Assiniboine (Canada)
Lahkota (USA)
Stoney (Canada)

Dhegiha Group

Kansa (USA)
Omaha-Ponca (USA)
Osage (USA)
Quapaw (USA)

Winnebago Group

Hocák (USA)

Dakota Group

Dakota (USA)

Missouri Valley Family

Crow (USA)
Hidatsa (USA)

Southeastern Family

Biloxi-Ofo Group

Biloxi (USA)
Ofo (USA)

Tutelo Group

Tutelo (USA)